Pencil



Nov. 6,1923. www@ W. P. DE WETT f PENCIL Filed April 19, 1920 fig/f7? Patented Nov. 6, i923.

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hihihihi?? W'ILLIAIM. P. DE WITT, OF SUMERVILLE, MASSACHUSETTS, ASSIGNOR TO DE WITT- LA FRANCE CO., 0F CAMBRIDGE, MASSACHUSETTS, A CORPGRATION OF MASSA- CHUSETTS.

PENCIL.

Application led April 19,

Be it known that l, iViLLiAM l. En il/vnr, a citixen ot the United States. residing at Somerville. in the count)vr of `Iiliddlese); and State ot ilaeaachusette, have invented new and useful linproveinents in Pencils, of which the iollowingr is av specification.

l'his invention relate@v to pencils with ad instable and removable leads and especially die invention relatee to that class of pencils in which the lead is of very small diameter so that the :saine may he used without sharpeninrj.

The object` of this invention is to provide a pencil or" the class set forth in which the lead can be ted forward tor use until it isalmoetv entirclv used up and the Small reinaiu` ingr butt is. Inallv ejected troni the pencil.

"he object, ot the invention is further to provide a. pencil oi the class set forth in which the mechanism Vfor advancing or teeth fue' forward the lead and also for electing il e lead from the pencil when used up is so c-z netructed and arranied that the head of the pencil` h v the rotation oit' which the lead ited 'l'orward and ejected, can be rotated craitinucusly even after the lead isejected i'rotn the pencil without injur)v to the niechaniein. and furthermore, the object o the invention is to provide a pencil or' the class deecribed in which by reverfsinrr the rotatoiw7V movement of the head the feeding and eject? iury nic-inhers ot' the pencil will he caused to retreat toward the rear end ot' the pencil iuorder Vthat a new lead may he inserted, and

after said iaenihere: have retreated to the ex treme rear end ot' their path ot movement a continued rotation or the hcad'of the pencill will canetno damage tothe operatingr parte.

rlie ohjc 't et tue invention further lto Simplify and cheapen the conetruetion of the pencil h v entirely eliminating an;Y soldered or hraned parte.

The invention coneistgl in the combination and arrangement ot' parts whereinY the ltoregroino objeta; are attained as hereinafter set torth in the specitication and particulzuu-"i/Y `pointed out in the claims.

Referring to the drawings:

Figure l is an enlarged sectional elevation ot' niv improved pencil.

Fig. 2- is a sectional plan taten on the line 2-2 of Figure i.

is a sectional ot Figure l.

plan taken on the line 1926. Serial No. 374,848.

Fig. l is a eide elevation as viewed ronr the right ot Figure l, illustrating a portion of the lead feeding mechanism.

5 i5 a detail elevation of aysprinw.

Fig. t3 is aside elevation of a connecting member.

Fig. T is a side elevation of a screwthreaded collar.

Fig. 8 is a side elevation ot a push-rod.

Fig. 9 is a side elevation of another screw threaded collar.

Fig. l() is a side elevation of the lead carrier tube.

Fig. ll is a side elevation of the. guide tube.

Fig. 12 is a detail section taken onthe line l2-i-2 of Fig. 9.

Fig. 13 is a detail line 13-l3 of Fig: 16. A

fliir. il: is a detail section taken on the, line ll-li of Figure ll.

Fig. l5 a detail View of a spline with a lateral projection.

Like numerals refer to like parts through out the several views o the drawings.

section taken on the ln the drawings, 15 is the outer casing of the pencil which terminates at its iront end in a conical end portion 1G, through an openin;r .li in the iront end oiE which the lead 1S is' ted. -it the rear end of the outer easinf;t 1.5 an annular liange 19 projects into an annular ygroove 2() provided in a tube. 2l which is rotatablyY mounted in the easingA 'l5 and projects rearwardlyv outside thereof to re eeive upon its outside a head and upon its inside at its rear end a tube 23 isr provided which contains an eraser 2l. At its forward end the tuhe, 2l is reduced in diameter at 25 forming' a trustro-conical portion and teri inmates in a cylindrical portion 26 which ifs a tight tit upon the propeller tuhe 2",said propeller tube ior a portion of its' length as al 2S is c vlindrical and for the remainder of its length. except as hereinafter set forth, is provided with an interior screw thread 29, whit i at its front end and at its rear end at 30 and til respectively said propeller tube ha5 a smooth here. w

'The l'ront end of' the propeller tube 27 hears againstthe .inner wall of an alignment, tube 32; said alignment tube consists of a truetroronieul portion against which the trout end of the propeller tube bears and which forms a bearingf therefor, a cylindrical portion 3e at the rear end thereofI and a pencii,

cyiiiciricai porties s iiic imm and fhcrsoi'n The iiiisiis-coziicai poiiifm iizs against the inner waii of me coniczii fuimixd and 16 of iii@ casing i5 and iiius pasiisns iie alignment ubc 32 iongritudinuiiy of iii@ casing, Th@ cyindrici poi'iion teiminates adjzlccn to he inner ssii ai the conical portion 1.6 ci said casing and ioims ii helder for a guide tube 36 which iis tigiitiy imo said cylindrical portion smi 'cxfciicis reziiwaidijf hcrefimii in the interior of the pi'opeiiei' mbe uiitii :it its rem: @mi it scars against a. i i? "which is ai, ccss iii in the portion 28 of the pi'opciiei tube and bea '5 against an imvai'iiiy pmjeciiigg' anniv ia? 58 on said propeiiei" miic.

The' tube 36 bears ai fczivsi-d emi agains the inner wail 0'3": Zim conicaiportoii i6 0f the casing and farms a guiiie for ai icaci Carrisr tubs 39 in which the iesd 18 is piaced and by 'which it is feci ioiigiiuciinaiiy of i-he This 4ciuiier tuba 39 is novifcd ih a Spiine i() whim is isst iii a sio, O' provided in the tube 39. Said spiinc O has a iaeraiiy extending' projection fhich when the several paris are assembled. as iilusmcd in Figui-e i, extends into :i hoi@ 43 in the coiiar @L push-rod 'fk5 siifies in the tubs 39 find ermimiics at its uapei smi in a iaerai arm 46 which Whn dis parts are assembled extends inw a iai' 48.

The collars 441 ami E sie saai; pisviciei wiii a screw iiircaci upon iiicii 'ciip scies alici are jfiined' 'togciie by :i CGnm-:ctingf member 49 which is proi'ificfi ai iis vom. cmi with a T-shaped iiezld 50 smi ai its iront end with a '5g-simpa@ head Si. said 'shapcii heacis being cfmnccied by a shank pefii 52 with cars 5i. iiiercsn and iiis siiask :,imrimi is iocaed sin@ 54 anni pms'idcd in iii@ ScrsW-threadc\fi collars i-i ami #i8 ispectively.

A spirai smiiig ciicii'ii/ics iis inicie ub 36 and is siidiibic iiicison, said spring serving if; iio'ki, iii@ guide member 49 in posiicn in hc shits' and 5i.

wiii be unricrsiood imf iiic coiiiirs ifi :mii 18 are siidiabiy mounted upn the guida hsbc 36, that they are ccmieccfi in eihei' n v iii@ connccing member 49 and tha, they are fer-ceci maar?, until they sfilis iis heads 51 mai 3G i sctivciy, by; iiie spimi spying 55S.

Tim dismctci ci the wie ci" tias csrici mim 39 -'iiiy siimiici- Siisii iii@ ciizizicisr icnc intended is uscfi tiici'swiih. The be 39 Qountci'suxii iii; und is siii: a iii, i'saiics at SQ as is ziiiw tim iczici to iii@ tiiiis asd jiigc iissif imo iii-:5 tuba v viiiie the aiigwvfii. S51-irc iras iicsn iissci'ibcd in it; p eicifrc for?- in *che fore going spcciication as coisisi-ng 0i! two c5'- lindricai-pm'ioiis 35 joined fzog'ehcc by a, frustG-conicai pois-Jimi i'tlwiii bs uw ,sT/Miss dcsiuod that i do mit confine myself to iiis sycciic, ccnsmciion or formfbnt this invention cfmcmpiatcs an aiigiimsm, ube consist ing of iwf) iubcs of dici'en iiizimciersioincii together? the larger oi rile tubcscngaging the casing uit the pencil ind staiimmry malaitiefciy ihcrco and wih a guide mbe itng the ube of smalier diameer and szztion'ary rciativciy thereto and having a member slid- :ibls longitudinally w'iihin the giiific tube.

" The generali operation @if 'iiie device herciiiiicfoic spcciicaly dcscribeci is as foiicws: ssumiiig ih@ parte; o be in ih@ isiaive'po- Siioiis imsmec in Figurcs l and fi and tiiai the head 22 is given :i i'cary ciockwise movcmen then iii@ tube 2i. wiil be rofated, thereby Causing iiie pi'opsiici tubs 2'? i0 r0- ae. The rotation of Suid propeller ube will @mise hc coiiairsli und i3 w ile fed forwardly in said ubs and this orwznd mova- 'ment of ihe csiiars wiii carry forward the.

carrie;- iubc 39 with tzc iead i8 and the push mai 5. When the carrier tubs 39 has been moved forwardly in his 'zimmer until the collar 44 is moved out if the screwthreaded portion 29 of the propeilcr tube 27( into the smooh here poition 30 theec, the collar 48 xviii continue to be fed forward by the screwtiii'cacied poiiion of ibs propeller tubs 2? and thc spring 55-Wiii and fils tube 39 forwardly until the and @i the Carrier tubs 39 abuis against the forii'aii pm'ioi (if the ciiic end 1, and during this forward movemsnt the coiisr 48 and 'iic pusimoii i5 xviii cmiimle iiicii' forward :uoifcmsii miti?. he spring 55 is suiiic'ieiitiy push the coilar the siilcoth boils portion 3G. Dulin' 'ahis iic ing xiii bcsbiii more compressed. sind iii@ coimccimg memssi mii smic. m his coin 8.

iias been moved io iis cxtreme forward posiion and the pusivrcd imsiiecn aise mme@ is iis minime ferwami pcsiioii -iius exp-2- iing' iiis icm? from iiic carrie? 'tube thai by iiicrrhcaci 'xviii have. no further eii'esupon iic iiim'cmeii, of the cslias and consel sueiiily iii@ carrier tubs and push-rod xviii r remain pi'aci-igaiigf sstiofnai'y imiii the iisafi 5,22 is ioscai in the cppssic iiection or in s cmmiei-cisckwis@ dir cifiiy whczeiipon the Qoiia 48 being pissscd against the forwm'd cmi ci the 'cw thread 29 by iii@ spring 55 *xviii cnci' saiii screw-threaded portion and comiiicncc, io be 'fed inward 'the Yfear and of tinued rotation ot the propeller tube until itenters the screw-threaded portion of Saitl propeller' tube, whereupon both the collars will be moved rearwardly together with the push-rod and the carrier tube.

new lead may be inserted in the carrier tube at any time after the push-rod has been drawn backwardly therein. The collars il and lo and the lead carrier 139 and pushrotl Ll5 together with the apring 55 and the connecting member 49 will be now moved beclmardly in the pencil until the collar :i8 enters the smooth bore portion 31 ot' the propeller tube. and then a continued rotation of the head Q2 will cause the collar ll to be moved toward the rear and the spring will push the collar 48 along the smooth lbore 5l until said collar i8 engageeV an inwardly extending ilange 59 on said probeller tube, whereupon further rearward inoreinent otl the collar 44: will comprese the springr 55 and the shank 52 will slide in the collar/ S until said collar Ll-lenters the Smooth bore portion 3l. whereupon further rotation of the head 9'2 in a counter-clockwise direction will hare practically no etect upon the collars l and lS and none ot' the parts of the pencil will be broltcn by acontinued counter-Clockwise rotation ot said head.

iow upon rotating the head 22 clockwise the collars will be caused lo enter 'the `screw-threaded portion ot the propeller tube in a manner similar to that hereinbetore described in relation to the movement ot' the collarsI 'trom the smooth bore portion 3l) into the ecrew-tlneaded portion ot the propeller tube.

.it will be understood that it is not necessary to cause the collars del and 4S lo more backwardly into the smooth bore portion -l, the distance to which said collars should be moved back being' regulated by the length ot' the new-lead. but in case that anyone usingr the pencil did continue rotating the heath either clocltwibfe or counterelocltwise beyond the time nece-Sear)v for the parte ot the pencil to perform their diti'crent functions, then the smooth bore portion` Il() and 3l will pre/vent injury to-the (litter-ent parts of the pencil.

The different parts of tht` pencil berlinbefore described are assembled as lbllowsr' The carrier tube is placed in the guide tube 36 witlrthe collar il placed in posi` tion on Said guide tube and with the lateral projection ft2- extending into the hole 42%. Next, the connecting' member all) placed in position on the collar l with the head 5l bea-ring against. the forward tace of saidcollar and the lateral prongs 51 thereon bearing against the rear face of lsaid collar. The spiral springv 55 is then plaoedin position upon the guide tube 36 over the connecting member and bearing against the collar 4:4,

then the collar d8 is laced on the. melrrodv with the arm lo projecting' in the hole l?, and the push-rod i5 inserted in the hole in the carrier tube 3S). then the spring 5313 is compressed and the head 5u on the connectiircr member i9 is slipped over the rear end ot the collar while-at. the Same time the shank portion 5i) enters the slot 525 ii said collar lo.

'lhe several parte hereinbetorc den'cribed are now in the relative punit-'ums illustrated in Figure l. the guide tube liti in' then `forced into the cylindrical portion lo of the alignment ltube 32 and the alignment tube, with the guide tube in' position therein. is then toi-ccd into the cae-iupr l5 until the l'iustro-coni'cal portion 33 is Seated against the conical portion 1G ot" the casing'` as illustra-ted in Fio'ure l. The disc $37 ie then forced into tne propeller tube :2T and down against the annular rib The cylindrical portion 26 of the tube 2l is then forced on to the rear end of the propeller tube. The propeller tube with the tube 2l attached thereto is now inserted in the casingy l5 and in rotated in a counterwlocltwiso direction until the .collars` i8 and ll einer the screw threaded portion ol' said propeller tube and the propeller' tube is then advanced to the position shown in Figure L and the rear end of the cae-iurr is Spun into the annular groove 20 in the tube 2l. The leads are then placed in the propeller tube in the chamber at the rear ot the disc 23T. yl`he eraser il i.-1 then forced into the tube ,Ztl and the tube 23 is placed in the rear end :l with which it has a snug friction iit.- 'the head Z2 is then pushed upon thel rear end o1" the casing' with which it has a tapered tit until it aseunies the position illustrated in :Figure l with its lorward edge contactingr with the rear end of the casing?r and just 'in advance otz the Hanne ll).

lhile l, have illuetralcd as the improved embodiment oi my invention iu respect to the alignment tube. a constriu'tion wherein a. cylindrical portion Silat the rear cud thereotl and a cylindrical portion 35 at the frontend thereof arent dill'crent diametersl and these two dill'ereut diameter tubes are joined together by a tritato-conical portion '53 integral therewith. it is evident that without departing; from the Spirit of my invention an alignment tube. in all respecte' the mechanical equivalent ot the alignment tube hereinbetore described aud illustrated` may be substituted thereffn' without departing Ytroni the spirit ot my invention in this respeet7 so long as two tubes one of larger diameter than the other are rigidly joined together.

1. A pencil having, in combination. an outer easing, a head rotatably mounted on the rear end of Said casing, a stationary lou si. 7 f 7 uw 1A @n a femgmcamy i rod slrmoie in said am agemn l teror screw hzmab :1 c@ 'im feb ris? mb@ mii slidably :md nowma mouned 'ugon SMC; guide mbe and ha I scl'aW-ihwded engagcmemi with said han rim Scw: rezuL another may fasened to 2@ helps mvv am@ msans m021 nr n..

o H101; I

' mams 1 whereby 5 ing, a carrier tube' for leads,

` in `wliicli'said :fast to said carrier tube, another collar havl0 ing a-screw-threaded periphery fast to 'said puslrrod, an interiorly screw-threaded propeller tube' withwhieh 'said collars have screwfthreaded enga-gement, means adapted to rotate said propeller tube, a member con- 5 nected to said collars and adapted to limit "the distance to which they may be moved apart, a .spring encircling said guide tube and connecting member, and a rotatable head connected to said propellerltube Wherea'by. upon the rotation of said head a reciprocatory motion may be imparted to said carrier tubeand to said pusli-rod.

9. A ,pencil having, in combination, a carrier tube for leads, a `guide tube in which said Carrier 4tube is slidably mounted, acolla-r fast to said carrier tube and havin threaded periphery,

a screw-A a push-rod s idable in said carrier tube, another collar having a Y screw-threaded periphery-fastv to said pushrod, a spring interposed between said collars,

means to limit the distanceto \vhioh said eellarsniay be moved apart, an interiorly serew-threaded propeller tube rotatably mountedv 1n said casing and liavinrgr screwthreaded eneagement with said collars, a.

head rotatably mounted on said casing and connected to said propellerA tube, the 'oppositeends ot said propeller tube each hav lin ga smooth bore whereby the distance to which said collars may be propelled by the 1- vnotation of said propeller tube is limited in lipposite directions.

ld; A pencil having, in combination, a

casing with a I and a cylindrical b'ody portion, an alignment casing, a carrier tube for leads, annide tube.

therefor, a projectioiy extending laterally from said carrier tube. a collar provided with' a hole into which said projection is adapted to extend. a push-rod slidable in said carrier tube, a lateral arm on said usb-rod, a collar provided with a hole into which said arm is adapted to project, a spring interposed between said collars, a member connecting said collars and adapted to limit the distance to whichthey may be separated by said spring, and means to iinparta reciprocatory motion to said collars.

11. A pencil having, in combination, :i

casing, a carrier tube for leads, a push-rod slidable in said carrier tube, a collar fast to said push-rod and 'having a screw threaded periphery, a rotatable interiorly screw-threaded propeller tube haviner screwthreaded engagement with said collar and rotatable within saidrasing. and means to imparta rotary motion to said screwthreaded propeller tube.

12A pencil having, in combination. a conical forward end portion tube having a cylindrical portion tightly tting the forward end of the cylindrical body portion ofsaid casing and terminating at its forward end in another cylindrical portion ot' smaller diameter, and a 'frustreeonieal 'portioin connecting said cylindrical portions and. fitting,r against the inner wall of the conical forward end ot said easing, a guide tube tightly fitting' lsaid last-named cylindrical portion, a push-rod slidable in said guide tubey and means to impart a reciprocatory motion to said push-rod.

ln testimony whereof I have hereunto set my hand in presence ot a witness.

WILLIAM P. DE WITT.

`Witnessz FRAHKLN E. Low. 

